Combined lock and switch for elevator doors



. 1,611,249 M. E. SMITH ET An.

COMBINED LOCK AND SWITCH FOR ELEVATOR DOORS Dec. "21 1926. 1,611,249 v M. E. SMITH ET AL COMBINED LocK AND SWITCHv Foa ELEvA'ronDooRs Filed Maron 19, '1924 2 sheets-sheet 2f JNVENTORS;

\ @N ww R mNmN coil spring 40 Awhich'bears atonefend against` the upper side'of the switch-arm and atits vother end-against a washer 4l', this spring tending constantlyv to 'resist movement or, said extension ont .of its Vinoperative vposition shown Ain Fig. 5. At its innery end the Y extension 37 is provided with an upwardly bent lip or projection 42, whichlengages transverse groove or "tulcrum ,seat formed Y inthe underside of theswitch ami-34. By

this vconstruction and arrangement oi" the switch arinfand'its extension,*the'latter permitted" to`.-roc k yieldinglyjrelatively Vto -thettoriner 'and 'at the'saine time' islield` against displacement lengthwise thereof.

The,stationaryV element oit the. switch consists of a pair of contacts 44 attached ltoan'd insnlatedfroin the casing 30 and to which l' the wires 45, 46 of. theA elevator control cir- 'cuit-are'conneoted. These twocontacts are adapted' tothe engaged or'bridg'ed by the cont`act'- plate S38 of Vthev movable' switcliarin to closeV the" control V"circuit and permit the Y operation vof theelevator.

A coil spring-'47 may beappled tothe V,switchl'arin 34 forr'inaintaining it inits nor?V Y' Assumerthe, operator `tor have stepped' into Vtheelevatorand to' have closed1the'-liatcli- Ai'vay-door tothe'position shown byV dotted lines B i'n Fig.- 4. cHe now grasps the hand VleverQl andturns it in an anti-eloclrwis'ev dil1'fection,fthe initial movement ofv which pro-k .j ects the loclrin g lbolts 24 `into the corresponding door-sill socket 96 andV opening 128 of the cas'ing- QQ to Ylockthey door, thev switch at this time beingfiinatiiected andreinaining in itsopen'position-shown in 5.`,' `Upon turning the handle further inthe saine' d1- Viectioint'o Aa `substanti'allyV np-'rightYV position,

vthe upper' loclringbolt strikes the projection ,3G ot the switcharm swinging the latter upwardlypland vcausing the Contact plate 3,8 of the extension' 3i to yieldinglyengage the attaching screws otthepair "oi contacts to nclose' the'switchf,` the,` spring 40 of said eX- fac tension Y insuring a perfect-,contact at all times.V Y Theswitchgfb'eing closed; the opera- 1tor can new*staiftthe-elevatOr through theKV e handle-inthe reverse directiongthe switchis iirstyo'pened andthen the locking bolts are operation "of this combined'*locke` and vunlocking y the dojor lby Vturning the withdrawn irointhe socket V26l "and 1 o'pening i 28,' permitting-the Vdoor to loe-readily opened lto the'position shown by full lines in Fig. 4.

In this position ofthe door it is impossible lto operate the elevator, therebyreducing the yliabilitj7 of accidentsrto a minini'im.,v

In'practice, the door frame 14, including .the vhinge"pintles for; theldoonsection l0 and the switch casing 30, is assembled at the VshopV and thenset inf-place on Ythe job. With thel Vtraine inv place, the door sections are then hung,'-thereby producing-a material savi ing in time' "andllabo'r invefecting 'thisinstallation. l

' :The Yolding door construction has y'they ad; Y

vantage that it can'be'swuno' back out of the Q l b way andv leave the tullv'width of the fdoor-V opening available?` Furthermore, Y infits closed position' the-door is lush'ywith the adjacentfside wallsfo'f tliedoor-opening and concealed behind f them Q Where it can not be tampered with ybv 'unauthorized persons.V Vle claim as `'our invention-v fr l. Thefcombination with l,the jhatchwajff. door and the control circuit offan"k elevator, of a casing securedto the'door-framev and having lan opening therein,`a 'iiXedf switch contact contained lwithinsaid casing andin- `r cluded lin'l the control circuit, a vmovable the combined lockandyswitch mechanism is switch arm-Vl arranged within'fsaid casing op vposite its'opening', an extensionV member lfiilcrumed to rock independently' ofsaid switchY Y arma-nd carryingans'wit'ch contactni'ountled on, :said 'arin,`means'V for -yieldingly conV arranged tof `Yinterlock "with Y said Y casingopening' andrcontro'lling said switch-ar`in.` ,2. The 'coinbinationwith'the hatchway Vdoor and thecontrolv circuit ofan elevator,` "of acasmg securedatotlie door-frame and having an opening therein, alxed' switch contact'contained withinlsaid casing andineludedinfthe-control' circu1t, movable 1mi Y necting .said extension member to the switchV arm, and a locking bolt carried by the door',

im Y

switch varm'arranged within said casing opposite its opening, an; extension member carrying switch contact mounted jon said `ari'n,kav pin connecting said extension mein# ber ywithsaid switchlarm, a spring applied( Yto .said pin Yfor vresistingii'iovement of the extension. -ineniber `relative 'toi the switch arnnand a' ,locking bolt carriedby the door, arrangedto interlock `with said'casing-'openfi ing and .controlling saidswitch arm;Vv f

lThe combination, v.with VYthe hatchway- 'I door-and the 1controly circ'uitof an elevator,

thereof, an extensionjnieniber havingfga',

iip

Yoffla casingzsecured to* rthe jdoor-:frainennd havingvv an vripening'therein; a (fixedswitch 'Contact contained lWithin ysaid vcasing and. inv Y 2vcluded in-the contro1 circuit,a movable Y switch` arni arranged-,within v-said casingopposite its'opening, said arm having,'a-trans `verse VVgroove in itsfunderside "nea'rg ne 'endl V lao` at itsinner end engaging the groove of said arm, 'means for-yieldingly resisting Inove- Y kment of4 said extension member relative! to said arm, aV vswitch contactcarriedby the` terlock with Said ycasing-ope.ningand ,con-- having an openngftherenya pair of fixed Y"switch contacts mounted neer. one end of `said casing and included in the control cr- T'cuit, a vertically-swinging, swltc-h arm fulcrumed at'l the opposite'end of said Vcasing and extending rxcross'theV opening thereof,v slaidiarmhevn'ig a transyerse groove in its underside, an extension membercfor the armv having 'a` lip at its inner endfengagingsid r tgfroove,v "a pinV passingv through Vsaidfextension member andlsad switch VVarm, V2L spring y `applet-ito said pinifor-normallyv resisting 'n movementvof the extension member frelatvei- 'to the switch arm, a swtchconta'ct connected .tofthe vfreie' end of Said extension lmember for enge;gementwithV said `fixed contactskyand Y fa locking bolt carried-bythe clo'oigerranged to interlock with said Casingfopemng 'and controllingv said switch arm.

f Y' 'MERRITT E. SMITH. 7 

